Question

162

image.onload function with return

rated 0 times [ 164] [ 2] / answers: 1 / hits: 54983 / 13 Years ago, thu, september 15, 2011, 12:00:00

I have a JS function where a value is computed and this value should be returned but I get everytime undefined but if I console.log() the result within this function it works. Could you help?

function detect(URL) {

    var image = new Image();

    image.src = URL;

    image.onload = function() {

        var result = [{ x: 45, y: 56 }]; // An example result

        return result; // Doesn't work

    }

}



alert(detect('image.png'));

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

samsons

Add To Favorites

Follow

Total Points: 331

Total Questions: 97

Total Answers: 106

Location: Macau

Member since Mon, Nov 16, 2020

4 Years ago

answered 13 Years ago gregoriocoya · Accepted Answer

I get it myself:

I didn't know that I can assign a variable to that (for me looking already assigned) onload.

function detect(URL) {

    var image = new Image();

    image.src = URL;

    var x = image.onload = function() {

        var result = [{ x: 45, y: 56 }]; // An example result

        return result;

    }();

    return x;

}



alert(detect('x'));